Preliminary Results of Combining Low Frequency Low Intensity Ultrasound and Liposomal Drug Delivery to Treat Tumors in Rats
Ultrasound is a convenient trigger for site-specific drug delivery in cancer therapy. Nanosized liposomes formulated from soy phosphatidyl choline, cholesterol, 1,2-distearoyl-sn-glycero- 3-phosphoethanolamine-N-[carboxy(polyethylene glycol)-2000] and alpha-tocopherol were loaded with Doxorubicin (D...
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| Other Authors: | , , , , , |
| Format: | article |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/11073/19736 |
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| Summary: | Ultrasound is a convenient trigger for site-specific drug delivery in cancer therapy. Nanosized liposomes formulated from soy phosphatidyl choline, cholesterol, 1,2-distearoyl-sn-glycero- 3-phosphoethanolamine-N-[carboxy(polyethylene glycol)-2000] and alpha-tocopherol were loaded with Doxorubicin (Dox) using a pH gradient. The liposomal suspension was infused through the tail vein of BDIX rats possessing bilateral intradermal DHD/K12 tumors on their hind legs. Then 20-kHz ultrasound was applied to only one of the tumors for 15 minutes. This therapy was repeated weekly for 4 weeks. The results showed that in five of six rats, the tumors regressed to non-measurable size within 4 weeks. A paired comparison of the normalized size of the insonated and non-insonated tumors in the same rat indicated that the insonated tumors were smaller (p < 0 0001, n = 6 rats, 21 pairs). This observation has significant potential for non-invasive site-specific therapy of solid tumors. |
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